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altera_tse: Correct rx packet length
Altera TSE MAC rx DMA transfer starts with the 2 additional bytes for IP payload alignment. This patch fixes tse_rx() function loop which reads DMA rx status and extracts packet length from it. Status signalises a whole DMA transfer length, which is 2 bytes longer than the packet itself. Signed-off-by: Vlastimil Setka <setka@vsis.cz> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -391,6 +391,12 @@ static int tse_rx(struct altera_tse_private *priv, int limit)
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"RCV pktstatus %08X pktlength %08X\n",
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pktstatus, pktlength);
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/* DMA trasfer from TSE starts with 2 aditional bytes for
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* IP payload alignment. Status returned by get_rx_status()
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* contains DMA transfer length. Packet is 2 bytes shorter.
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*/
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pktlength -= 2;
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count++;
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next_entry = (++priv->rx_cons) % priv->rx_ring_size;
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